Method and apparatus for contactless transmission of electrical energy between a wall and a door leaf/window sash fastened to this wall

Abstract

A method to transmit electrical energy between a wall and a door leaf fastened to the wall includes providing a primary power coil and a secondary power coil which are in an inductive operative connection. An electrical primary current flowing through the primary power coil is measured to obtain a measured value. The measured value is supplied to a primary power electronics device which stores a transmission characteristic as a function of a power available at the secondary power coil in dependence on a primary power supplied to the primary power coil. A maximum provided power is applied to the primary power coil when an electrical primary current increases. A secondary power voltage induced in the secondary power coil is limited to a preset maximum value. A primary current is measured and, based thereon, a power applied to the primary power coil is reduced until a required power is induced.

What is claimed is: 
     
         1 - 5 . (canceled) 
     
     
         6 . A method for a contactless transmission of electrical energy between a wall and a door leaf/window sash fastened to the wall in an articulated fashion via hinges about a hinge axis, the method comprising:
 providing a primary power coil fastened to the wall;   providing a secondary power coil fastened to the door leaf/window sash, the primary power coil and the secondary power coil being configured to be in an inductive operative connection with each other;   measuring an electrical primary current flowing through the primary power coil so as to obtain a measured value;   supplying the measured value to a primary power electronics device which is configured to store a transmission characteristic as a function of a power available at the secondary power coil in dependence on a primary power supplied to the primary power coil;   applying a maximum provided power to the primary power coil when an electrical primary current increases;   limiting a secondary power voltage induced in the secondary power coil to a preset maximum value; and   measuring a primary current and, based on the measured primary current, reducing a power applied to the primary power coil until a required power, which is stored according to the transmission characteristic of the secondary power coil in the primary power electronics device, is induced.   
     
     
         7 . The method as recited in  claim 6 , wherein a change of the power applied to the primary power coil is effected by varying a primary voltage and a pulse width of the primary voltage. 
     
     
         8 . The method as recited in  claim 7 , wherein the pulse width of the primary voltage is a rectangular alternating voltage. 
     
     
         9 . An apparatus for a contactless transmission of electrical energy between a wall and a leaf/sash fastened to the wall in an articulated fashion via hinges about a hinge axis, the device comprising:
 a primary power coil configured to be fastened to the wall;   a secondary power coil configured to be fastened to the leaf/sash;   a primary power electronics device configured to store a transmission characteristic as a function of a power available at the secondary power coil in dependence on a primary power supplied to the primary power coil;   a current measuring device configured to measure a current that flows in the primary power coil so as to obtain a measured value which is suppliable to the primary power electronics device;   a primary power influencing device configured to influence the primary power applied to the primary power coil; and   a voltage-limiting device configured to limit a secondary voltage value generated by induction in the secondary power coil to a preset maximum voltage value.   
     
     
         10 . The device as recited in  claim 9 , wherein the primary power influencing device comprises at least one of a switching controller and an AC-DC inverter comprising a pulse width modulator. 
     
     
         11 . The device as recited in  claim 9 , further comprising a rectifier, the rectifier being configured to convert a secondary power voltage induced in the secondary coil to direct voltage.